Three-dimensional printer



FIG. 1 top-front perspective view of a three-dimensional printer showing the new design;

FIG. 2 is a bottom-front perspective view thereof;

FIG. 3 is a bottom-rear perspective view thereof;

FIG. 4 is a top-rear perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a back view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof;

FIG. 9 is a top view thereof; and,

FIG. 10 is a bottom view thereof. 

CLAIM The ornamental design for a three-dimensional printer, as shown and described. 